Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

A253322

Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

Terms

    a(0) =286a(1) =1026a(2) =3787a(3) =7744a(4) =19312a(5) =34660a(6) =74953a(7) =132376a(8) =271506a(9) =490768a(10) =988800a(11) =1844508a(12) =3697682a(13) =7081648a(14) =14179216a(15) =27648718a(16) =55339218a(17) =109108332a(18) =218332780a(19) =433235548a(20) =866776878a(21) =1726118188a(22) =3452993316a(23) =6889953894a(24) =13781692502

External references